add unit tests

tests/utils/formatting.test.ts

@@ -0,0 +1,43 @@
+import { describe, expect, it } from 'vitest';
+import { capitalize, formatDate, splitAndCapitalize } from '../../src/utils/formatting';
+
+describe('formatDate', () => {
+    it('formats date in it-IT locale and includes seconds when requested', () => {
+        const withoutSeconds = formatDate('2026-01-01T12:34:56.000Z');
+        const withSeconds = formatDate('2026-01-01T12:34:56.000Z', true);
+
+        expect(withoutSeconds).toContain('2026');
+        expect(withSeconds).toContain('56');
+    });
+});
+
+describe('capitalize', () => {
+    it('capitalizes every space-delimited word', () => {
+        expect(capitalize('hello WORLD')).toBe('Hello World');
+        expect(capitalize('mUlTi   SPACES')).toBe('Multi   Spaces');
+    });
+});
+
+describe('splitAndCapitalize', () => {
+    it('splits underscore and hyphen mode', () => {
+        expect(splitAndCapitalize('hello_world-test', 'underscore')).toBe('Hello World Test');
+    });
+
+    it('splits camel mode with acronym and number boundaries', () => {
+        expect(splitAndCapitalize('helloWorldXML2Http', 'camel')).toBe('Hello World Xml 2 Http');
+    });
+
+    it('auto mode prefers underscore splitting when underscore-like chars exist', () => {
+        expect(splitAndCapitalize('user_name')).toBe('User Name');
+        expect(splitAndCapitalize('kebab-case')).toBe('Kebab Case');
+    });
+
+    it('auto mode falls back to camel splitting when underscore-like chars are absent', () => {
+        expect(splitAndCapitalize('helloWorldTest')).toBe('Hello World Test');
+    });
+
+    it('returns empty string for empty or missing input', () => {
+        expect(splitAndCapitalize('')).toBe('');
+        expect(splitAndCapitalize(undefined)).toBe('');
+    });
+});